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On Wed, 12 Nov 2008 13:55:12 -0000, Whiskers <catwheezel@operamail.com> wrote:

> On 2008-11-12, Arfa Daily <arfa.daily@ntlworld.com> wrote:
>>
>> "Whiskers" <catwheezel@operamail.com> wrote in message
>> news:slrnghjjbg.e5j.catwheezel@ID-107770.user.individual.net...
>>> On 2008-11-11, Arfa Daily <arfa.daily@ntlworld.com> wrote:
>>>> "Whiskers" <catwheezel@operamail.com> wrote in message
>>>> news:slrnghja8j.e5j.catwheezel@ID-107770.user.individual.net...
>>>>> On 2008-11-10, Dave Plowman (News) <dave@davenoise.co.uk> wrote:
>>>>>> In article <slrnghhb1o.bes.catwheezel@ID-107770.user.individual.net>,
>>>>>>    Whiskers <catwheezel@operamail.com> wrote:
>>>
>>> [...]
>>>
>>>> A system carrying a lot of amps to the load that's drawing it, is no more
>>>> or
>>>> less dangerous than one that's only carrying a small current, except in
>>>> as
>>>> much as there is a greater potential for heat failure at connection
>>>> points
>>>> within that system. A high voltage system, irrespective of how many amps
>>>> it
>>>> is capable of carrying above a few milliamps, is far more dangerous to a
>>>> human, than a low voltage system good for a few hundred amps. Given the
>>>> (reasonably) constant resistance of any described path through the human
>>>> body, a voltage of a hundred volts with a current availability of as
>>>> little
>>>> as 50mA, may be enough to kill under the right (wrong!) circumstances.
>>>
>>> So a charge of 10kV from walking across a carpet (DC) , or a "non-lethal"
>>> 50kV "Tazer" (AC), are more dangerous than a 1kV power line?  The danger
>>> from 'High Voltage' power lines comes from the vast amount of current they
>>> can deliver.
>>
>> You see, there you go getting your apples and oranges mixed up again. A
>> static charge from a carpet is not lethal to you because it is an extremely
>> high resistance source. That is the nature of a static charge. No matter
>> whether it is 1kV, 10kV or 40kV, the source resistance will ensure that only
>> uA will flow for decimals of a uS. Enough to give you a nasty little crack,
>> yes, but not enough to come within several orders of magnitude of being
>> lethal. The same applies to the taser. It is designed to not be able to
>> supply enough current (theoretically) to be lethal. However, its aim is to
>> incapacitate by disrupting nerve activity and causing extreme pain. To do
>> this, the charge is applied to the receiving body in multiple short-duration
>> pulses. In some cases, this has proven to be fatal, I believe, due to the
>> length of time that the pulses are delivered for. On the other hand, a high
>> voltage power line, or even a fairly low voltage household supply, *is*
>> potentially lethal not because it can deliver huge amounts of amps, but
>> because the voltage that is present, is sufficient to drive *enough* (mili)
>> amps from that low resistance source through the conduction path within the
>> body.
>
> Precisely; it isn't the voltage that's lethal, it's the current.  If the
> current isn't available, the voltage is pretty harmless.  High-voltage
> mains power lines carry a /lot/ of current, whereas high-voltage 'Tazers'
> don't.

"Current kills" is a vast oversimplification, as Arfa has explained.


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